Data centre cabinet and pressure spray system thereof

ABSTRACT

A data center cabinet includes a cabinet body, an oil distribution device and a plurality of liquid distributors. The cabinet body includes a number of mounting racks. The cabinet body is sequentially mounted with a number of server housings from high to low. A server is placed in the server housing. A liquid distributor is provided above each of the server housings. The oil distribution device is connected to the liquid distributor via an oil intake device. Cooling liquid oil is pumped into the oil distribution device by a pump, the oil distribution device distributes oil flow to the liquid distributor under the pressure of the pump, and the liquid distributor sprays the cooling liquid oil to the server for cooling. The present invention also relates to a pressure spray system.

CROSS-REFERENCE TO RELATED APPLICATIONS

This non-provisional patent application is a continuation application of an international application No. PCT/CN2017/074962 filed on Feb. 27, 2017 which is based upon and claims priority to Chinese Patent Application No. 201710046284.1, filed on Jan. 20, 2017, which are incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a large server cooling system, in particular to a data centre cabinet and a pressure spray system thereof.

BACKGROUND

Driven by the big data service and market, all kinds of servers, blade servers, etc. used in the data centre have significantly increased power and higher and higher arrangement density. Correspondingly, the heat dissipation problem under high heat flux has attracted much attention, which has also become the focus and technical bottleneck of data centre construction and the operation and maintenance work thereof. An indirect or direct liquid cooling mode is considered as the inevitable trend of heat dissipation for the data centre due to its high comprehensive heat exchange efficiency. In particular, in view of the advantages of direct heat-source contact for heat absorption, a high comprehensive heat exchange coefficient of liquid cooling and very small heat transfer resistance, a direct liquid cooling mode is theoretically the most effective way to dissipate heat.

Most of the traditional cabinets use air cooling methods for heat dissipation, and the cooling capacity is limited. If the density of equipment in the cabinet increases, the internal temperature of the equipment will rise sharply and cannot be effectively cooled. In addition, the traditional cabinet is of an open structure, with a low ingress protection (IP) level, local turbulence and heat dissipation dead corners, resulting in a low heat dissipation efficiency and high energy consumption.

SUMMARY

The purpose of the present invention is to overcome the above problems existing in the prior art and provide a data centre cabinet and a pressure spray system thereof, so as to solve the cooling problem of a large server cabinet.

In order to realize the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized by the following technical solutions:

a data centre cabinet, comprising a cabinet body, an oil distribution device and a number of liquid distributors, wherein the cabinet body comprises a number of mounting racks; the cabinet body is sequentially mounted with a number of server housings from high to low; a server is placed in the server housing; one of the liquid distributors is provided above each of the server housings; the oil distribution device is connected to the liquid distributor via an oil intake device; and cooling liquid oil is pumped into the oil distribution device by a pump, the oil distribution device distributes oil flow to the liquid distributor under the pressure of the pump, and the liquid distributor sprays the cooling liquid oil to the server for cooling.

Further, the liquid distributor comprises an oil return chamber, an oil spray chamber, a liquid distribution oil inlet and an oil return port; the oil return chamber is positioned above the oil spray chamber; the liquid distribution oil inlet is positioned in the oil spray chamber; a lower bottom face of the oil spray chamber is provided with a spray hole; the spray hole is directly opposite the server; the oil return chamber receives the cooling liquid oil flowing through the server above the liquid distributor; and the oil return port is used for discharging the cooling liquid oil in the oil return chamber.

Further, the liquid distributor further comprises an overflow hole; the overflow hole is provided on the lower bottom face of the oil spray chamber; the overflow hole is higher than the lower bottom face of the oil spray chamber; and the oil return chamber is at an included angle to the horizontal plane.

Further, the server housing comprises an upper cover and a box; the upper cover is fixed on the box; the upper cover comprises a coolant intake pipe, at least one spray pressure chamber, at least one spray hole and an upper cover shell, and the box comprises a box shell and a coolant outlet pipe; an inner surface of the upper cover shell is provided with the spray pressure chamber, the coolant intake pipe is connected to the spray pressure chamber, and each spray pressure chamber is provided with the spray hole; and the spray hole is directly opposite a heating chip area of the server.

Further, the data centre cabinet further comprises an oil intake switch valve; the oil intake switch valve is installed at the joint between the server housing and the oil intake device and the joint between the liquid distributor and the oil intake device; the oil intake switch valve comprises a switch valve oil inlet, a valve core, a valve body, a switch and a telescopic oil outlet; the switch valve oil inlet is connected to the oil intake device; and the switch controls the valve core and the telescopic oil outlet.

Further, the oil distribution device comprises an oil distribution pressure regulating valve; and the oil distribution pressure regulating valve adjusts the oil outlet pressure at the outlet of an oil distribution branch corresponding to the liquid distributor.

In another aspect, the present invention further provides a pressure spray system of the above described data centre cabinet. The pressure spray system comprises a main oil tank, a pump, a radiator, an oil return device and cooling liquid oil. The main oil tank, the pump, the radiator and the data centre cabinet are connected into a closed oil circuit by the oil intake device and the oil return device; the cooling liquid oil is pumped out of the main oil tank by the pump, and then, after passing through the radiator for heat exchange, enters the oil distribution device in the data centre cabinet through a pipeline. The oil distribution device distributes oil into the liquid distributor under pressure, and the liquid distributor sprays to cool the server; and the cooling liquid oil after the cooling treatment returns to the main oil tank through the oil return device.

Further, the pressure spray system further comprises a filter and an auxiliary oil tank; the filter is connected in the closed oil circuit; the oil intake device comprises an oil intake pipeline, an oil intake tank and an oil intake branch pipe; the oil intake tank is connected to the oil distribution device, and a lower end is connected to the auxiliary oil tank; one side of the oil intake tank is connected to the oil intake branch pipe; the other end of the oil intake branch pipe is connected to the server housing or the liquid distributor; an oil intake regulating valve is further provided at the joint between the oil intake tank and the oil intake branch pipe; the oil return device comprises an oil return tank and an oil return pipeline; the auxiliary oil tank is connected to the main oil tank through an oil return pipeline; and the oil return port of the liquid distributor is in communication with the oil return tank.

Further, the cooling liquid oil is insulating liquid oil, including at least one of natural mineral oil, silicone oil, plant oil, transformer oil and heat transfer oil; the server housing is internally provided with cooling liquid oil; and the cooling liquid oil occupies 0%-50% of the space of the server housing.

The beneficial effects of the present invention are as follows:

1. a liquid cooling spray system is used, the specific heat capacity of cooling liquid oil is high, and the cooling liquid oil is in direct contact with a heating element, thus the heat transfer efficiency is high;

2. the device uses standardized module design, which not only meets the use requirements, but also meets the installation and assembly requirements, and in actual use, the device can satisfy all cabinet servers;

3. the device uses the standardized module design, which has considerable advantages for mass production and maintenance;

4. during the whole process, the cooling liquid oil is in a flowing state, and there will be no local high temperature due to oil collection;

5. by using the pressure oil distribution device, the flowing rate of the sprayed cooling liquid oil is uniform and the pressure is constant, thus ensuring the stability of the system and also prolonging the service life of the components.

The description above is only an overview of the technical solutions of the present invention. In order to more clearly understand the technical means of the present invention, so that same can be implemented according to the contents of the description, preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Particular implementations of the present invention are given in detail by the following embodiments and accompanying drawings thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and descriptions thereof are used to explain the present invention, and do not constitute improper limits to the present invention. In the drawings:

FIG. 1 is a schematic diagram of a pressure spray system of the present invention;

FIG. 2 is a schematic diagram of a liquid distributor and liquid distribution of a server;

FIG. 3 is a schematic diagram of a planar structure of the liquid distributor;

FIG. 4 is a schematic diagram of the internal structure of an oil intake switch valve of the present invention;

FIG. 5 is a top view of the oil intake switch valve of the present invention;

FIG. 6 is a structural schematic diagram of a server subrack of the present invention;

FIG. 7 is a first schematic diagram of the interior of the server subrack of the present invention; and

FIG. 8 is a second schematic diagram of the interior of the server subrack of the present invention.

Description of reference numerals in the figures: main oil tank 1, pump 2, radiator 3, pressure oil distribution device 4, filter 5, oil intake device 6, liquid distributor 7, oil return chamber 71, oil spray chamber 72, liquid distribution oil inlet 73, oil return port 74, overflow hole 75, spray hole 76, oil return device 8, server housing 10, upper cover 101, fastener 102, seal 103, box 104, adapter plate 105, coolant intake pipe 106, closed flow channel 107, spray pressure chamber 108, spray hole 109, upper cover shell 110, insertion hole 111, heating chip area 112, partition 113, box shell 114, mounting post 115, coolant outlet pipe 116, oil intake switch valve 16, switch valve oil inlet 161, valve core 162, valve body 163, switch 164, and telescopic oil outlet 165.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and in conjunction with embodiments.

With reference to FIGS. 1-8, a pressure spray system of a data centre cabinet, as shown in FIG. 1, comprises a main oil tank 1, a pump 2, a radiator 3, a data centre cabinet, an oil intake device 6, an oil return device 8 and cooling liquid oil. The main oil tank 1, the pump 2, the radiator 3 and the data centre cabinet are connected into a closed oil circuit by the oil intake device 6 and the oil return device 8. The cooling liquid oil is pumped out of the main oil tank 1 by the pump 2, and then, after passing through the radiator 3 for heat exchange, enters the oil distribution device 4 in the data centre cabinet through a pipeline. The oil distribution device 4 distributes oil into the liquid distributor 7 under pressure, and the liquid distributor 7 sprays to cool the server. The cooling liquid oil after the cooling treatment returns to the main oil tank 1 through the oil return device 8.

Preferably, the pressure spray system further comprises a filter 5 and an auxiliary oil tank. The filter 5 is connected in the closed oil circuit. The oil intake device 6 comprises an oil intake pipeline, an oil intake tank and an oil intake branch pipe. The oil intake tank is connected to the oil distribution device 4, and a lower end is connected to the auxiliary oil tank. One side of the oil intake tank is connected to the oil intake branch pipe. The other end of the oil intake branch pipe is connected to the server housing or the liquid distributor 7. An oil intake regulating valve is further provided at the joint between the oil intake tank and the oil intake branch pipe. The oil return device 8 comprises an oil return tank and an oil return pipeline. The auxiliary oil tank is connected to the main oil tank 1 through an oil return pipeline. The oil return port 74 of the liquid distributor 7 is in communication with the oil return tank. As shown in FIG. 1, the position of the filter 5 is not limited, and whether the filter is disposed in front of the pump 2 or behind the pump 2 or behind the radiator 3 should be within the scope of protection of the present invention.

A data centre cabinet, as shown in FIG. 1, comprises a cabinet body, an oil distribution device 4 and a number of liquid distributors 7. The cabinet body comprises a number of mounting racks. The cabinet body is sequentially mounted with a number of server housings 10 from high to low. A server is placed in the server housing 10. One of the liquid distributors 7 is provided above each of the server housings 10. The oil distribution device 4 is connected to the liquid distributor 7 via an oil intake device 6. Cooling liquid oil is pumped into the oil distribution device 4 by a pump 2, the oil distribution device 4 distributes oil flow to the liquid distributor 7 under the pressure of the pump 2, and the liquid distributor 7 sprays the cooling liquid oil to the server for cooling. Generally, in order to ensure the overall structural strength of the cabinet, the cabinet body is made of a metal material. In particular, a flexible material can also be used to manufacture the cabinet body.

Preferably, as shown in FIGS. 2 and 3, the liquid distributor 7 comprises an oil return chamber 71, an oil spray chamber 72, a liquid distribution oil inlet 73 and an oil return port 74; the oil return chamber 71 is positioned above the oil spray chamber 72; the liquid distribution oil inlet 73 is positioned in the oil spray chamber 72; a lower bottom face of the oil spray chamber 72 is provided with a spray hole 76; the spray hole 76 is directly opposite the server; the oil return chamber 71 receives the cooling liquid oil flowing through the server above the liquid distributor 7; and the oil return port 74 is used for discharging the cooling liquid oil in the oil return chamber 71. Preferably, the liquid distributor 7 further comprises an overflow hole 75; the overflow hole 75 is provided on the lower bottom face of the oil spray chamber 72; the overflow hole 75 is higher than the lower bottom face of the oil spray chamber 72; and the oil return chamber 71 is at an included angle to the horizontal plane. As shown in FIG. 2, the oil return port 74 is directly opposite the oil return tank of the oil return device 8, and the cooling liquid oil returning from the oil return port 74 flows into the main oil tank 1 through the oil return tank. The liquid distributor 7 corresponding to each layer of server is provided with a number of overflow holes 75, and the height of the overflow holes 75 is 5-20 mm higher than that of an oil spray plate, so as to ensure the depth of an oil level in the oil spray chamber 72. When the amount of oil intake is greater than the amount of oil sprayed (for example, when a single layer of server is serviced), the excess amount of oil enters the server through the overflow holes 75. The overflow holes 75 are located in a region where heating elements are relatively concentrated, thereby improving the heat dissipation efficiency of the server.

It should be understood that the liquid distributor 7 is used to practically distribute the cooling liquid oil after distribution in the oil distribution device 4 according to the actual position to be cooled. Generally, the liquid distributor 7 is manufactured separately from the server housing 10. The liquid distributor 7 is installed on the server housing 10 as the structure shown in FIGS. 3 and 4, and the server housing 10 is of an open structure.

In another embodiment, as shown in FIGS. 6-8, the server housing 10 is preferably a server subrack when specifically implemented. From the manufacturing process, the liquid distribution function or overflow function of the liquid distributor 7 is combined with the server subrack structure. The server subrack comprises an upper cover 101 and a box 104. The upper cover 101 is fixed on the box 104. The upper cover 101 comprises a coolant intake pipe 106, at least one spray pressure chamber 108, at least one spray hole 109 and an upper cover shell 110, and the box 104 comprises a box shell 114 and a coolant outlet pipe 116. An inner surface of the upper cover shell 110 is provided with the spray pressure chamber 108, the coolant intake pipe 106 is connected to the spray pressure chamber 108, and each spray pressure chamber 108 is provided with the spray hole 109. The spray hole 109 is directly opposite a heating chip area 112 of the server. Preferably, the box 104 is internally provided with a flow channel, and the coolant outlet pipe 116 is in communication with the flow channel The server subrack further comprises a seal 103, and the upper cover 101 is hermetically installed with the box 104 through the seal 103. The inner surface of the box shell 114 is also provided with a partition 113. The flow channel and the heating chip area 112 of the server are located on the same side of the partition 113. In this embodiment, the server is divided into a heating chip area 112 and a non-main heating area by the partition 113 in the server subrack, i.e., the liquid flow channel in the server subrack is planned to further ensure the central heat dissipation to the heating area and improve the heat dissipation efficiency. Preferably, as shown in FIG. 6, an adapter plate 105 may be provided on the outer side of the box shell 114. The adapter plate 105 is provided with various sockets or interfaces for connecting storage devices and other servers.

Preferably, as shown in FIG. 7, the upper cover 101 further comprises a closed flow channel pipe 107, and the coolant intake pipe 106 is connected to the spray pressure chamber 108 via the closed flow channel pipe 107. The use of the closed flow channel pipe 107 can ensure that the coolant intake pipe 106 is better connected to the spray pressure chamber 108, and can facilitate the rational arrangement of the spray pressure chamber 108 on the inner surface of the upper cover shell 110.

Preferably, as shown in FIGS. 6-8, the server subrack further comprises fasteners 102; a plurality of insertion holes 111 are arranged at an edge of the upper cover shell 110; a number of through holes are arranged at an edge of the seal 103; the through holes correspond to the insertion holes 111; a number of mounting posts 115 are arranged at an edge of the box shell 114; and the mounting posts 115 correspond to the insertion holes 111 and the through holes. The fasteners 102 cooperate with the insertion holes 111, the through holes and the mounting posts 115. The upper cover 101, the seal 103 and the box 104 are fixedly connected together through the fasteners 102. The fasteners can be connected to the mounting posts 115 by pins or threads, and that the insertion holes or through holes are arranged at the edges of the upper cover shell and the seal 103 does not affect the arrangement of key structures therein and is also convenient to disassemble and assemble. Preferably, the coolant intake pipe 106 is horizontally disposed on one side of the upper cover shell 110, the coolant outlet pipe 116 is horizontally disposed on one side of the box shell 114, and the coolant intake pipe 106 is located above the coolant outlet pipe 116. The coolant outlet pipe 116 is located below the coolant intake pipe 106, which is advantageous for the coolant to be discharged from top to bottom under pressure. The coolant intake pipe 106 is located above the coolant outlet pipe 116, and that the coolant enters the box will not be hindered by pressure. Preferably, in order to ensure that the bottom of the box 104 has a small amount of residual coolant, the coolant outlet pipe 116 is higher than the bottom of the box shell 114. The residual coolant can be used to partially soak and cool the server, but the residual coolant should not pass over the upper surface of the server and will not affect the spraying effect. Preferably, in order to allow the coolant to smoothly and quickly flow out of the server subrack, based on the principle of pressure, the bottom face on the inner side of the box shell 114 is at an included angle to the horizontal plane.

Preferably, as shown in FIGS. 4 and 5, the data centre cabinet further comprises an oil intake switch valve 16; the oil intake switch valve 16 is installed at the joint between the server housing 10 and the oil intake device 6 and the joint between the liquid distributor 7 and the oil intake device 6; the oil intake switch valve 16 comprises a switch valve oil inlet 161, a valve core 162, a valve body 163, a switch 164 and a telescopic oil outlet 165; the switch valve oil inlet 161 is connected to the oil intake device 6; and the switch 164 controls the valve core 162 and the telescopic oil outlet 165. The oil intake switch valve controls the opening and closing of the cooling liquid oil entering the liquid distributor 7 and also realizes the extension and retraction of the telescopic oil outlet 165. During operation, the oil intake switch valve 16 is in an open state, the switch valve core 162 is at a certain distance from the oil inlet, and at this time the telescopic oil outlet 165 is also in an extended state, and thus cooling liquid oil flows into the liquid distributor 7 through the oil inlet 161 and the telescopic oil outlet 165. When the server needs maintenance, a handle switch 164 is rotated to drive the switch valve core 162 to rotate and move towards the direction of the oil inlet 161 to close the oil inlet 161, while the telescopic oil inlet 165 is retracted to close the liquid flow space, so as to ensure that the server is not affected by the liquid when pulled out for service.

Preferably, in order to solve the problem of providing cooling hydraulic oil with uniform pressure and flow rate to the server housings 10 at different heights, the pressure oil distribution device 4 comprises an oil distribution pressure regulating valve. The oil distribution pressure regulating valve adjusts the oil outlet pressure at the outlet of an oil distribution branch corresponding to the liquid distributor. It should be understood that both the oil distribution pressure regulating valve and the oil intake regulating valve function to ensure that the pressure and flow rate of the cooling liquid oil entering the liquid distributor 7 are consistent, and can be used alone or in combination to achieve constant pressure and constant flow rate.

Preferably, the cooling liquid oil is insulating liquid oil, including at least one of natural mineral oil, silicone oil, plant oil, transformer oil and heat transfer oil; the server housing 10 is internally provided with cooling liquid oil; and the cooling liquid oil occupies 0%-50% of the space of the server housing 10. In order to achieve a better cooling effect, the cooling liquid oil in the server housing 10 maintains a certain liquid level height. The cooling liquid oil fully contacts the main heating elements of the server and absorbs heat. After being collected through the oil return pipeline, the cooling liquid oil flowing back from each layer of server returns again into the main oil tank 1.

The present invention is ingenious in design, rational in structure and innovative in method, breaks through the traditional cooling manner for large servers, has strong practicability and is convenient for popularization.

1. A liquid cooling spray system is used in the present invention, the specific heat capacity of cooling liquid oil is high, and the cooling liquid oil is in direct contact with a heating element, thus the heat transfer efficiency is high.

2. The present invention uses standardized module design, which not only meets the use requirements, but also meets the installation and assembly requirements. In actual use, the device can satisfy all cabinet servers.

3. The present invention uses standardized module design, which has considerable advantages for mass production and maintenance.

4. According to the present invention, during the whole process, the cooling liquid oil is in a flowing state, and there will be no local high temperature due to oil collection.

5. The present invention uses an oil distribution device, so that the flowing rate of the sprayed cooling liquid oil is uniform and the pressure is constant, thus ensuring the stability of the system and also prolonging the service life of the components.

The foregoing has merely described preferred embodiments of the present invention, and is not intended to limit the present invention in any form. Any person of ordinary skill in the industry can smoothly implement the present invention as shown in the accompanying drawings and the foregoing of the description. However, equivalent changes such as alterations, modifications or variations made by those skilled in the art from the technical contents disclosed above without departing from the scope of the technical solutions of the present invention are all equivalent embodiments of the present invention. In addition, any equivalent changes such as alterations, modifications or variations to the above embodiments according to the technical essence of the present invention are still within the scope of protection of the technical solutions of the present invention. 

What is claimed is:
 1. A data centre cabinet, comprising: a cabinet body, wherein the cabinet body comprises a plurality of mounting racks; an oil distribution device; and a plurality of liquid distributors; wherein the cabinet body is sequentially mounted with a plurality of server housings from top to bottom; each server housing of the plurality of server housings is internally provided with a server; above the each server housing, one of the plurality of liquid distributors is provided; the oil distribution device is connected to each liquid distributor of the plurality of liquid distributors via an oil intake device; a cooling liquid oil is pumped into the oil distribution device by a pump, the oil distribution device distributes an oil flow to the each liquid distributor under a pressure of the pump; the each liquid distributor sprays the cooling liquid oil to the server for cooling; and the each liquid distributor comprises an oil return chamber, an oil spray chamber, a liquid distribution oil inlet and an oil return port; the oil return chamber is positioned above the oil spray chamber; the liquid distribution oil inlet is positioned in the oil spray chamber; a lower bottom face of the oil spray chamber is provided with a spray hole; the spray hole is directly opposite to a respective one of the servers below the each liquid distributor; the oil return chamber receives the cooling liquid oil from another respective one of-the servers above the each liquid distributor; and the oil return port is configured for discharging the cooling liquid oil in the oil return chamber.
 2. The data centre cabinet according to claim 1, wherein the each liquid distributor further comprises an overflow hole; the overflow hole is provided on the lower bottom face of the oil spray chamber; the overflow hole is at a position higher than the lower bottom face of the oil spray chamber; and at an included angle is provided between the oil return chamber and a horizontal plane.
 3. The data centre cabinet according to claim 2, wherein the data centre cabinet further comprises an oil intake switch valve; the oil intake switch valve is installed at a joint between the each server housing and the oil intake device and a joint between the each liquid distributor and the oil intake device; the oil intake switch valve comprises a switch valve oil inlet, a valve core, a valve body, a switch and a telescopic oil outlet; the switch valve oil inlet is connected to the oil intake device; and the switch controls the valve core and the telescopic oil outlet.
 4. The data centre cabinet according to claim 3, wherein the oil distribution device comprises an oil distribution pressure regulating valve; the oil distribution pressure regulating valve adjusts an oil outlet pressure at an outlet of an oil distribution branch of the each liquid distributor.
 5. The data centre cabinet according to claim 1, wherein the each server housing comprises an upper cover and a box; the upper cover is fixed on the box; the upper cover comprises a coolant intake pipe, at least one spray pressure chamber, at least one spray hole and an upper cover shell; the box comprises a box shell and a coolant outlet pipe; an inner surface of the upper cover shell is provided with the at least one spray pressure chamber; the coolant intake pipe is connected to the at least one spray pressure chamber; the spray pressure chamber is provided with the at least one spray hole; and the at least one spray hole is directly opposite to a heating chip area of the server.
 6. The data centre cabinet according to claim 5, wherein the data centre cabinet further comprises an oil intake switch valve; the oil intake switch valve is installed at a joint between the each server housing and the oil intake device and a joint between the each liquid distributor and the oil intake device; the oil intake switch valve comprises a switch valve oil inlet, a valve core, a valve body, a switch and a telescopic oil outlet; the switch valve oil inlet is connected to the oil intake device; and the switch controls the valve core and the telescopic oil outlet.
 7. The data centre cabinet according to claim 6, wherein the oil distribution device comprises an oil distribution pressure regulating valve; the oil distribution pressure regulating valve adjusts an oil outlet pressure at an outlet of an oil distribution branch of the each liquid distributor.
 8. A pressure spray system of a data centre cabinet, the data centre cabinet comprising a cabinet body, an oil distribution device and a plurality of liquid distributors, wherein the cabinet body comprises a plurality of mounting racks; the cabinet body is sequentially mounted with a plurality of server housings from top to bottom; each server housing of the plurality of server housings is internally provided with a server; above the each server housing, one of the plurality of liquid distributors is provided; the oil distribution device is connected to the each liquid distributor of the plurality of liquid distributors via an oil intake device; a cooling liquid oil is pumped into the oil distribution device by a pump; the oil distribution device distributes an oil flow to the each liquid distributor under a pressure of the pump, and the each liquid distributor sprays the cooling liquid oil to the server for cooling; the pressure spray system comprising a main oil tank, a radiator, an oil return device and the cooling liquid oil, wherein the main oil tank, the pump, the radiator and the data centre cabinet are connected into a closed oil circuit by the oil intake device and the oil return device; the cooling liquid oil is pumped out of the main oil tank by the pump, after passing through the radiator for a heat exchange, the cooling liquid oil enters the oil distribution device in the data centre cabinet through a pipeline; the oil distribution device distributes the cooling liquid oil into the each liquid distributor under a pressure; the each liquid distributor sprays the cooling liquid oil to cool the server; the cooling liquid oil after a cooling treatment returns to the main oil tank through the oil return device; and the each liquid distributor comprises an oil return chamber, an oil spray chamber, a liquid distribution oil inlet and an oil return port; the oil return chamber is positioned above the oil spray chamber; the liquid distribution oil inlet is positioned in the oil spray chamber; a lower bottom face of the oil spray chamber is provided with a spray hole; the spray hole is directly opposite to a respective one of the servers below the each liquid distributor; the oil return chamber receives the cooling liquid oil from another respective one of-the servers above the each liquid distributor; and the oil return port is configured for discharging the cooling liquid oil in the oil return chamber.
 9. The pressure spray system according to claim 8, wherein the each liquid distributor further comprises an overflow hole; the overflow hole is provided on the lower bottom face of the oil spray chamber; the overflow hole is at a position higher than the lower bottom face of the oil spray chamber; and an included angle is provided between the oil return chamber and a horizontal plane.
 10. The pressure spray system according to claim 9, wherein the data centre cabinet further comprises an oil intake switch valve; the oil intake switch valve is installed at a joint between the each server housing and the oil intake device and a joint between the each liquid distributor and the oil intake device; the oil intake switch valve comprises a switch valve oil inlet, a valve core, a valve body, a switch and a telescopic oil outlet; the switch valve oil inlet is connected to the oil intake device; and the switch controls the valve core and the telescopic oil outlet.
 11. The pressure spray system according to claim 10, wherein the oil distribution device comprises an oil distribution pressure regulating valve; the oil distribution pressure regulating valve adjusts an oil outlet pressure at an outlet of an oil distribution branch of the each liquid distributor.
 12. The pressure spray system according to claim 11, wherein the pressure spray system further comprises a filter and an auxiliary oil tank; the filter is connected in the closed oil circuit; the oil intake device comprises an oil intake pipeline, an oil intake tank and an oil intake branch pipe; the oil intake tank is connected to the oil distribution device; a lower end of the oil intake tank is connected to the auxiliary oil tank; one side of the oil intake tank is connected to a first end of the oil intake branch pipe; a second end of the oil intake branch pipe is connected to the each server housing or the each liquid distributor; an oil intake regulating valve is further provided at a joint between the oil intake tank and the oil intake branch pipe; the oil return device comprises an oil return tank and an oil return pipeline; the auxiliary oil tank is connected to the main oil tank through the oil return pipeline; and the oil return port of the liquid distributor is in communication with the oil return tank.
 13. The pressure spray system according to claim 12, wherein the cooling liquid oil is an insulating liquid oil, the insulating liquid oil is at least one selected from a group consisting of a natural mineral oil, a silicone oil, a plant oil, a transformer oil and a heat transfer oil; the each server housing is internally provided with the cooling liquid oil; and the cooling liquid oil occupies 0%-50% of a space of the each server housing.
 14. The pressure spray system according to claim 10, wherein the pressure spray system further comprises a filter and an auxiliary oil tank; the filter is connected in the closed oil circuit; the oil intake device comprises an oil intake pipeline, an oil intake tank and an oil intake branch pipe; the oil intake tank is connected to the oil distribution device; a lower end of the oil intake tank is connected to the auxiliary oil tank; one side of the oil intake tank is connected to a first end of the oil intake branch pipe; a second end of the oil intake branch pipe is connected to the each server housing or the each liquid distributor; an oil intake regulating valve is further provided at a joint between the oil intake tank and the oil intake branch pipe; the oil return device comprises an oil return tank and an oil return pipeline; the auxiliary oil tank is connected to the main oil tank through the oil return pipeline; and the oil return port of the liquid distributor is in communication with the oil return tank.
 15. The pressure spray system according to claim 14, wherein the cooling liquid oil is an insulating liquid oil, the insulating liquid oil is at least one selected from a group consisting of a natural mineral oil, a silicone oil, a plant oil, a transformer oil and a heat transfer oil; the each server housing is internally provided with the cooling liquid oil; and the cooling liquid oil occupies 0%-50% of a space of the each server housing.
 16. The pressure spray system according to claim 9, wherein the pressure spray system further comprises a filter and an auxiliary oil tank; the filter is connected in the closed oil circuit; the oil intake device comprises an oil intake pipeline, an oil intake tank and an oil intake branch pipe; the oil intake tank is connected to the oil distribution device; a lower end of the oil intake tank is connected to the auxiliary oil tank; one side of the oil intake tank is connected to a first end of the oil intake branch pipe; a second end of the oil intake branch pipe is connected to the each server housing or the each liquid distributor; an oil intake regulating valve is further provided at a joint between the oil intake tank and the oil intake branch pipe; the oil return device comprises an oil return tank and an oil return pipeline; the auxiliary oil tank is connected to the main oil tank through the oil return pipeline; and the oil return port of the liquid distributor is in communication with the oil return tank.
 17. The pressure spray system according to claim 16, wherein the cooling liquid oil is an insulating liquid oil, the insulating liquid oil is at least one selected from a group consisting of a natural mineral oil, a silicone oil, a plant oil, a transformer oil and a heat transfer oil; the each server housing is internally provided with the cooling liquid oil; and the cooling liquid oil occupies 0%-50% of a space of the each server housing.
 18. The pressure spray system according to claim 8, wherein the each server housing comprises an upper cover and a box; the upper cover is fixed on the box; the upper cover comprises a coolant intake pipe, at least one spray pressure chamber, at least one spray hole and an upper cover shell; the box comprises a box shell and a coolant outlet pipe; an inner surface of the upper cover shell is provided with the at least one spray pressure chamber; the coolant intake pipe is connected to the at least one spray pressure chamber; the spray pressure chamber is provided with the at least one spray hole; and the at least one spray hole is directly opposite to a heating chip area of the server.
 19. The pressure spray system according to claim 18, wherein the data centre cabinet further comprises an oil intake switch valve; the oil intake switch valve is installed at a joint between the each server housing and the oil intake device and a joint between the each liquid distributor and the oil intake device; the oil intake switch valve comprises a switch valve oil inlet, a valve core, a valve body, a switch and a telescopic oil outlet; the switch valve oil inlet is connected to the oil intake device; and the switch controls the valve core and the telescopic oil outlet.
 20. The pressure spray system according to claim 19, wherein the oil distribution device comprises an oil distribution pressure regulating valve; the oil distribution pressure regulating valve adjusts an oil outlet pressure at an outlet of an oil distribution branch of the each liquid distributor.
 21. The pressure spray system according to claim 20, wherein the pressure spray system further comprises a filter and an auxiliary oil tank; the filter is connected in the closed oil circuit; the oil intake device comprises an oil intake pipeline, an oil intake tank and an oil intake branch pipe; the oil intake tank is connected to the oil distribution device; a lower end of the oil intake tank is connected to the auxiliary oil tank; one side of the oil intake tank is connected to a first end of the oil intake branch pipe; a second end of the oil intake branch pipe is connected to the each server housing or the each liquid distributor; an oil intake regulating valve is further provided at a joint between the oil intake tank and the oil intake branch pipe; the oil return device comprises an oil return tank and an oil return pipeline; the auxiliary oil tank is connected to the main oil tank through the oil return pipeline; and an oil return port of the liquid distributor is in communication with the oil return tank.
 22. The pressure spray system according to claim 21, wherein the cooling liquid oil is an insulating liquid oil, the insulating liquid oil is at least one selected from a group consisting of a natural mineral oil, a silicone oil, a plant oil, a transformer oil and a heat transfer oil; the each server housing is internally provided with the cooling liquid oil; and the cooling liquid oil occupies 0%-50% of a space of the each server housing.
 23. The pressure spray system according to claim 19, wherein the pressure spray system further comprises a filter and an auxiliary oil tank; the filter is connected in the closed oil circuit; the oil intake device comprises an oil intake pipeline, an oil intake tank and an oil intake branch pipe; the oil intake tank is connected to the oil distribution device; a lower end of the oil intake tank is connected to the auxiliary oil tank; one side of the oil intake tank is connected to a first end of the oil intake branch pipe; a second end of the oil intake branch pipe is connected to the each server housing or the each liquid distributor; an oil intake regulating valve is further provided at a joint between the oil intake tank and the oil intake branch pipe; the oil return device comprises an oil return tank and an oil return pipeline; the auxiliary oil tank is connected to the main oil tank through the oil return pipeline; and an oil return port of the liquid distributor is in communication with the oil return tank.
 24. The pressure spray system according to claim 23, wherein the cooling liquid oil is an insulating liquid oil, the insulating liquid oil is at least one selected from a group consisting of a natural mineral oil, a silicone oil, a plant oil, a transformer oil and a heat transfer oil; the each server housing is internally provided with the cooling liquid oil; and the cooling liquid oil occupies 0%-50% of a space of the each server housing.
 25. The spray system according to claim 18, wherein the pressure spray system further comprises a filter and an auxiliary oil tank; the filter is connected in the closed oil circuit; the oil intake device comprises an oil intake pipeline, an oil intake take and an oil intake branch pipe; the oil intake tank is connected to the oil distribution device; a lower end of the oil intake tank is connected to the auxiliary oil tank; one side of the oil intake tank is connected to a first end of the oil intake branch pipe; a second end of the oil intake branch pipe is connected to the each server housing or the each liquid distributor; an oil intake regulating valve is further provided at a joint between the oil intake tank and the oil intake branch pipe; the oil return device comprises an oil return tank and an oil return pipeline; the auxiliary oil tank is connected to the main oil tank through the oil return pipeline; and an oil return port of the liquid distributor is in communication with the oil return tank.
 26. The pressure spray system according to claim 25, wherein the cooling liquid oil is an insulating liquid oil, the insulating liquid oil is at least one selected from a group consisting of a natural mineral oil, a silicone oil, a plant oil, a transformer oil and a heat transfer oil; the each server housing is internally provided with the cooling liquid oil; and the cooling liquid oil occupies 0%-50% of a space of the each server housing.
 27. The pressure spray system according to claim 8, wherein the pressure spray system further comprises a filter and an auxiliary oil tank; the filter is connected in the closed oil circuit; the oil intake device comprises an oil intake pipeline, an oil intake tank and an oil intake pipe; the oil intake tank is connected to the oil distribution device; a lower end of the oil intake tank is connected to the auxiliary oil tank; one side of the oil intake tank connected to a first end of the oil intake branch pipe; a second end of the oil intake branch pipe is connected to the each server housing or the each liquid distributor; an oil intake regulating valve is further provided at a joint between the oil intake tank and the oil intake branch pipe; the oil return device comprises an oil return tank and an oil return pipeline; the auxiliary oil tank is connected to the main oil tank through the oil return pipeline; and an oil return port of the each liquid distributor is in communication with the oil return tank.
 28. The pressure spray system according to claim 27, wherein the cooling liquid oil is an insulating liquid oil, the insulating liquid oil is at least one selected from a group consisting of a natural mineral oil, a silicone oil, a plant oil, a transformer oil and a heat transfer oil; the each server housing is internally provided with the cooling liquid oil; and the cooling liquid oil occupies 0%-50% of a space of the each server housing. 